
Here \(f_{\mathrm {NL}}\)  sets the amplitude of the primordial bispectrum, and \(K(\mathbf {k}_1, \mathbf {k}_2)\)  is an integration kernel specifying the shape of the primordial bispectrum. There are several typical choices for this kernel, usually referred to as bispectrum templates [1]}, [2]}, [3]}. These include the local (LC), orthogonal (OR), and the equilateral (EQ) templates. Since PNG enters only through the initial conditions of a simulation, our model should immediately generalize to these cosmologies without the need for additional parameters or training.
